Concept:The emphatically stressed word is the one that corrects a wrong detail from the question asked.
Explanation:Here, BAG receives the emphatic stress.
This shows that the speaker is correcting what the item is, not any other part of the statement.
A question that mentions a different item would naturally lead to this response.
Option C asks, "Will she send a shirt to him today?"
The reply to it is, "No, she will send a BAG to him today."
Thus, BAG is contrasted with shirt in the previous question.
Option A questions the doer, which would require stress on SHE.
Option B questions the receiver, which would require stress on HIM.
Option D questions the time, which would require stress on TODAY.
So only Option C can be correctly answered with emphatic stress on BAG.
Answer:Option C: Will she send a shirt to him today?